Just thought I would throw this out. When I was working in a vintage shop in SF I developed this system.
Of course the best thing to do is try a jacket on myself and extrapolate size or try on someone else that you know their size.
But in laying flat and measuring, this is what I would do.
Measure arm pit to arm pit, then for a vintage double breasted suit subtract two inches, or one and a half for smaller sizes, then double and there is your size.
for single breasted fifties suits, I would subtract one and a half inch, or one maybe for smaller sizes.
For sixties suits that fit snugly, I would only subtract one inch.
Mind you, I subtract before doubling. IF you take the full measurement of say 48 inches, then subtract four.
Of course sometimes you get lucky andthe size is in the pociet tag.
Other than the oddball that was obviouysly not the right size on the tag, it seemsed to be consistant with stated size and the size shown from trying on.
How it compares to modern suit sizing I don't know.
I think I am a 38 short, but in modern sizing I would probably wear a 36 short.
Of course the best thing to do is try a jacket on myself and extrapolate size or try on someone else that you know their size.
But in laying flat and measuring, this is what I would do.
Measure arm pit to arm pit, then for a vintage double breasted suit subtract two inches, or one and a half for smaller sizes, then double and there is your size.
for single breasted fifties suits, I would subtract one and a half inch, or one maybe for smaller sizes.
For sixties suits that fit snugly, I would only subtract one inch.
Mind you, I subtract before doubling. IF you take the full measurement of say 48 inches, then subtract four.
Of course sometimes you get lucky andthe size is in the pociet tag.
Other than the oddball that was obviouysly not the right size on the tag, it seemsed to be consistant with stated size and the size shown from trying on.
How it compares to modern suit sizing I don't know.
I think I am a 38 short, but in modern sizing I would probably wear a 36 short.